33 



IV.— Shell lance-shape, subovate, with central ridge, and side expansions 

 of some length. Family, Belotectthid^. Five fossil genera, 

 Teudopsis, Phylloteuthis, Beloteuthis, Geoteuthis, and Lepto- 

 teuthis. 



6. Teudopsis, Deslongchamps, 1835 ... 



7. Phylloteuthis, Meek and Hayden, 

 1858. 



8. Beloteuthis, Minister, 1843 



9. Geoteuthis, Munster, 1843 



= Belemnosepia, Agassiz, 1835. 

 =Loligosepia, Quenstedt, 1843. 

 = Coccoteuthis (pars), Owen, 1855. 



10. Leptoteuthis, Meyer, 1824 



Narrow at top, enlarged below, with a 

 concavity at base, and narrow central 

 rib ; Liassic into Oolite. 



Narrow at top, enlarged below, with slight 

 concavity at base, where the lateral 

 margins are obtusely angular ; Cre- 

 taceous. 



Pointed at top and bottom, lateral ex- 

 pansions forming a sudden angle on the 

 sides towards the lower half of total 

 length ; Liassic. 



Wide at top, pointed at base, side expan- 

 sions forming a sudden angle on the 

 sides towards the upper half of total 

 length; Liassic. 



Wide and rounded at top, pointed at base, 

 lateral expansions gradually angular, 

 ribs slight and diverging ; Oolitic. 



V. — Shell ovate, thick, with thin lateral projections, inclined to the 



sides, terminating in a projecting point imperfectly chambered. 

 Family, Sepiad^e (Owen, 1838). One fossil genus, Sepia. 



11. Sepia, Liune, 1801......... Oolitic and Tertiary. 



= Belosepia, Yoltz, 1830 

 = Sepiolithes, Munster, 1843 

 = Trachyteuthis, Meyer, 1846. 

 = Coccoteuthis, Owen, 1855. 

 = Palseoteuthis, Roemer, 1856. 



VI. — Shell conical, slightly bent, having at its upper part a cavity con- 



taining chambers with a siphuncle. Family, Belemnosidje. 

 Four fossil genera, Belemnosis, Beloptera, Helicerus, and 

 Spirulirostra. 



12. Belemnosis, Edwards, 1849 Shell conical, and suddenly bent at a 



short distance from the base, no side 

 expansions ; Tertiary. 



13. Beloptera, Deshayes, 1830 Shell conical, and slightly bent, side ex- 



pansions at the angle ; Tertiary. 



14. Helicerus, Dana, 1849 Shell conical, the chambers at the upper 



part, slender and terminating in a spiral 

 arrangement ; Liassic ? 



15. Spirulirostra, D'Orbigny, 1842... Shell conical, the chambers at the upper 



part, of some size and terminating in a 

 spiral arrangement, the portion cover- 

 ing the commencement of the spiral 

 projected forwards, the extremity 

 pointed ; Tertiary. 



VII. — Shell straight, with a series of conical chambers at its upper 



portion. Family, Belemnitid^e (Owen, 1838). Five fossil genera, 

 Belemnites, Belemnitella, Belemnoteuthis, Conoteuthis, and 

 Xiphoteuthis. 



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